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Department of Electrical Engineering, University College London, Torrington Place, London, UK. ' Department of Electrical Engineering, University College London, Torrington Place, London, UK. ' Department of Electrical and Computer Engineering, National Technical University of Athens, Heroon, Polytehniou 9 Str., GR-15773, Zografou, Greece. ' Department of Electrical and Computer Engineering, National Technical University of Athens, Heroon, Polytehniou 9 Str., GR-15773, Zografou, Greece. ' Hitachi Europe Ltd., Hitachi Sophia Antipolis, France |